In a message dated 02/08/00 17:10:53 GMT Daylight Time, lconklin@............ writes: > My most important move was away from the driveway. Up till that > point I had a Toyota detector. Larry, This suggests that you probably ARE picking up magnetic interference. On your SG rig, you have a powerful bar magnet part way down the pendulum, don't you? This can react to any changes in the local magnetic field. Might it be a good idea to check if any of your noise signals are associated with any domestic appliances? As a rough guide, a 1/4 x !/4 x 1 inch Alnico magnets as used for reed switches produced 50 nT at 53" and a smaller 4.5 x 4.5 x 28 mm magnet give a similar field at 45". This is about the change you see on the Earth's field on a 'quiet' day. Magnetic storms can give over 10x this. Regards, Chris __________________________________________________________ Public Seismic Network Mailing List (PSN-L)
Larry Cochrane <cochrane@..............>